syllable stress and compound noun stress

[Viktoria.]

Помогите, п-та разобраться со следующим объяснением:

It's important to note that there's a major difference between syllable stress and compound noun
stress patterns. In the syllable count exercises, each syllable was represented by a single musical
note. In the noun phrases, each individual word will be represented by a single musical note—no
matter how many total syllables there may be.
At times, what appears to be a single syllable word will have a "longer" sound to it— seed takes
longer to say than seat for example.

[Tango]

А в чем проблема? Какие-то упражнения, два разных варианта. В одном - музыкальные ноты играются на каждом слоге в слове. В другом - на каждом слове в предложении...